Vacuum Levitation Melting Technology

Vacuum Levitation Melting Technology

  Vacuum levitation melting technology uses the electromagnetic force to levitate the liquid metal pool or cause quasi-levitation, which adopts electromagnetic induction heating power supply and melts the material
under the vacuum or inert gas atmosphere.
  Levitation Melting is known as the most advanced melting technology in the world, its
advancement is reflected in two aspects: first, it eliminates the gas and crucible contamination to the
melt with vacuum technology, due to this characteristic, levitation melting technology has important
significance to produce and research the active metals and alloys, high purity and super pure metals
and alloys, as well as the complex alloys and intermetallic compound,etc; Second, it gets rid of the
limitation on melting temperature from crucible material——most ceramic crucibles are unable to
endure the high temperature above 2000 ℃. So the levitation melting technology has important
significance to research and develop refractory metals and alloys, compounds and ceramic material,
etc
  Levitation Melting Technology includes two kinds: Complete levitation melting technology and
Cold crucible induction melting technology.
Complete Levitation Melting Technology does not use crucible, the involved high frequency
power output of sensor consists of levitation coils and above stable rewind coils, and the liquid
metal pool is levitating in the coils during melting (Fig.1).Although the effect of complete levitation
melting is ideal, its melting capacity is a few grams which only applicable to small-scale laboratory
test.
  Cold crucible induction melting technology is developed on the basis of vacuum induction
melting, uses the segmented water-cooled cold copper crucible and supersonic frequency power, the
electromagnetic field passes through the cold crucible to produce the induced eddy current, the eddy
current heats and melts the metal charge, meanwhile, the eddy current interacts with magnetic line
of force so that produces the Lorentz force which supports and levitates the liquid metal pool or
causes the quasi-levitation. Fig.2 shows the core part of this technology. Fig.3 shows the hump
shaped levitation liquid metal pool in the cold crucible.